This DRO
modification has been removed for the lathe CNC conversion
but the information has been retained for reference.

Micro Lathe DROsTaig Micro Mill DROs for the Z1- & X-Axes. Both scales have SPC
outputs.
The Z1-axis uses an eight-inch scale. The
X-axis uses a two-inch-range digital gage (manual) with a readout to 0.0005".
Its mounting stem is 8mm instead of the US standard
3/8" (9.525mm) diameter stem. The gage turns on & off
automatically.
When in the OFF mode, both scales still maintain their readings & will track
movement & zero button presses.
The OFF mode just turns off the LCD to nominally conserve the battery.

The bottom/back
of the Taig mill carriage is rough cast aluminum.
It needed to be fly cut flat & parallel using the
RF-25 mill. Minimal material was removed.

BracketsDetail of the bottom with the X-axis bracket attached to the
carriage using
two, pre-existing cap-head screws.
These two screws hold the gib in-place. Slightly longer 4-40 screws with washers were all that
was needed.
Two, ground down, M3-0.5 screws affix the transducer. If they are too long
they can touch the scale back.

Detail of the Z1-axis bracket top. Two, 10-32 button-head
screws with washers hold the two separate brackets together.
This design helps when aligning the scale & allows a quick disconnect if I want
to remove the carriage from the dovetail slide.
Both brackets are 1/8" thick aluminum.
In operation, the ratcheting-type carriage locking lever hangs down vertically
for access.

AlignmentDetail of Z1-axis scale bracket. Held to the aluminum base
plate with long, 6-32 cap-head screws.
10-32 button-head screws with washers hold down the OEM scale brackets.
Right Z1-axis scale bracket. Shims (thin washers) were used in the
final alignment.